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Journal of Applied Computer Science
EN The main contribution of this article is the application of hybrid Fourier wavelet transform to data space reduction in clothing sales volume time series. We show that hybrid Fourier wavelet transform can be used to reduce the data space of abovementioned time series and gives promising results. The[...]
Control and Cybernetics
2011 Vol. 40, no 4 1231-1247
EN A new steganographicmethod based on Fourier transform is proposed. Data is attached in the frequency domain within the limits of the audible band. Masked frequencies are used to conceal information in order to make the changes inaudible for human ear. This approach allows for modification in the sou[...]
Challenges of Modern Technology
EN The Hilbert transform and the analytic signal are widely known tools of 1D signal pro cessing. They are useful for many applications, such as AM-FM demodulation or edge detection. Developing the multidimensional generalization of this method is particularly important for the purposes of image proces[...]
Metrology and Measurement Systems
2013 Vol. 20, nr 4 645--654
EN In this paper the method of fast impedance spectroscopy of technical objects with high impedance (|Zx| ≥ 1 GΩ) is evaluated by means of simulation and a practical experiment. The method is based on excitation of an object with a sinc signal and sampling the response signals proportional t[...]
Archives of Mechanics
2013 Vol. 65, nr 3 219--236
EN In this study, the frictionless contact problem between a coated layer and a half-plane is considered when they are pressed by a rigid cylindrical stamp. Upon loading, two unknown contact widths and contact pressures occur on the contact areas the advanced contact area between the stamp and the coat[...]
Przegląd Elektrotechniczny
2010 R. 86, nr 1 175-177
PL W artykule przedstawiono teorię obliczania transformaty Fouriera funkcji ciągłych i zanikających w nieskończoności. Procedura jest oparta o wykorzystanie średnich Gaussa. Parametr regularyzacji jest połączony w prosty sposób z poziomem błędu danych wejściowych.
EN Regularization theory for calculation of the Fourier transformations of continuous functions that vanish at infinity is considered. Procedure is based on using of the Gauss means. The regularization parameter is simple connected with error level of input data.
Fundamenta Informaticae
EN The advances of network technologies and digital devices facilitate users to exchange multimedia data over the public networks. However, this also raises significant concerns about how to protect sensitive multimedia data from being illegally copied and unauthorized modifications. Thus, this paper p[...]
Metrology and Measurement Systems
EN Nowadays a geometrical surface structure is usually evaluated with the use of Fourier transform. This type of transform allows for accurate analysis of harmonic components of surface profiles. Due to its fundamentals, Fourier transform is particularly efficient when evaluating periodic signals. Wave[...]
Journal of Applied Analysis
EN Let (Ω, A, P) be a complete probability space. We show that the trivial function is the unique L1 -solution of the following refinement type equation [wzór] for a wide class of the given functions φ. This class contains functions of the form [wzór]
Optica Applicata
EN Problems of designing the holographic Fourier transform elements are described. First, two different configurations for a Fourier transform setup are considered. The converging beam Fourier transform (CB-FT) is simpler than the conventional parallel beam Fourier transform (PB-FT) setup, and it appea[...]
Zeszyty Naukowe Politechniki Białostockiej. Budowa i Eksploatacja Maszyn
2001 Z. 8 199-212
PL Każdy sygnał pomiarowy jest zakłócany sygnałami losowymi (szumami). Nie można ich jednak zidentyfikować prowadząc jedynie analizę w dziedzinie częstotliwości Przedstawiona transformata falkowa umożliwia badania zarówno w dziedzinie częstotliwości, jak i czasu. Została ona wykorzystana do analizy prz[...]
EN Each measured signals are depended on stochastic factors. Now, effectiveness of filtering process can't be done by analysis frequency domain. Due to wavelet transform can be done signal analysis in frequency and time domain. In this paper courses of biomechanical signals were used. Wavelet signal tr[...]
Opuscula Mathematica
2015 Vol. 35, no. 6 867--887
EN We define and study the generalized continuous wavelet transform associated with the Riemann-Liouville operator that we use to express the new inversion formulas of the Riemann-Liouville operator and its dual.
Zeszyty Naukowe. Mechanika / Politechnika Opolska
2011 z. 99 49-49
EN This paper investigated the fracture behaviour of a piezoelectromagneto- elastic material subjected to electromagnetomechanical loads. The PEMO- elastic medium contains a straight-line crack which is parallel to its poling direction and loaded surface of the half-space. Fourier transform technique i[...]
Journal of KONES
2017 Vol. 24, No. 4 173--180
EN In this paper, the authors present an introduction to the new method of evaluating the indicator diagram of internal combustion engine. For several years, it was observed that analyses of combustion processes have been hardly changed since they were conducted for the first time. At the moment, the d[...]
Optica Applicata
EN This paper reviews two techniques that have been recently published for three-dimensional profilometry and proposes one shot profilometry using iterative two-step temporal phase-unwrapping by combining the composite fringe projection and the iterative two-step temporal phase unwrapping algorithm. In[...]
Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna
PL W pracy przedstawiono zastosowanie analizy Fouriera do efektywnej segmentacji obrazów drobnych naczyń wieńcowych w standardowych obrazach koronarograficznych.
EN Application of Fourier analysis for segmentation of standard coronarography images of smali coronary vessels, is discussed.
Zeszyty Naukowe Akademii Morskiej w Gdyni
2019 nr 111 24--38
EN It is convenient to analyse wireless channels and links by exploiting their input-output description. This approach relies on treating the system as a black box, whose behaviour can be fully described by the relationship between the input and output signals. In this paper, we study a relationship of[...]
Optica Applicata
2019 Vol. 49, nr 2 217--226
EN Anomalous hollow beam has potential applications in the optical trapping and free space optical communications, etc. It is noted that, thus far, although a large number of studies have been carried out in this field, most of them are theoretical studies and only quite a few cases have experimental r[...]
Archives of Acoustics
2019 Vol. 44, No. 2 239--249
EN The radiation of sound waves from partially lined duct is treated by using the mode-matching method in conjunction with the Wiener-Hopf technique. The solution is obtained by modification of the Wiener-Hopf technique and involves an infinite series of unknowns which are determined from an infinite s[...]
Archives of Control Sciences
EN In this paper the discrete Fournier transform (DFT) is used for determining the transfer function coefficients for second-order linear systems (...). The proposed algorithm is theoretically attractive, practically fast and has been implemeted in Matlab. Two step-by-step examples illustrating the app[...]
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